The oral cavity plays an integral role in the functions of the human body. Not only does it aid in chewing, digestion, and nutrition, it also plays a significant role in appearance, speech and sensation. The teeth are arranged in the mouth in 2 arches that contain 2 quadrants each (16 teeth in each arch, 8 teeth in each quadrant in the permanent dentition). The top arch is the maxillary arch and it is fixed. The bottom arch is the mandibular arch and it is capable of movement through the temporomandibular joint.